An elevator with two passengers stops at the second, third, and fourth floors. If it is equally likely that a passenger gets off at any of the three floors, what is the probability that the passengers get off at different floors?
Thanks.
An elevator with two passengers stops at the second, third, and fourth floors. If it is equally likely that a passenger gets off at any of the three floors, what is the probability that the passengers get off at different floors?
Thanks.
Pr(passengers get off at different floors) = 1 - Pr(passengers get off at the same floor).
Pr(passengers get off at different floors) = 1 - Pr(passengers get off at the same floor)
So, Pr(passengers get off at the same floor) = 2/6
Therefore, 1 -2/6 = 4/6 = 2/3
Last edited by ThePerfectHacker; Mar 26th 2009 at 08:48 AM.